class_docstr: Example:
      >>> #The dataset is split into data, validation_data
      >>> model = ProphetForecaster(changepoint_prior_scale=0.05, seasonality_mode='additive')
      >>> model.fit(data, validation_data)
      >>> predict_result = model.predict(horizon=24)
docstr: Save the forecaster.
  
  :param checkpoint_file: The location you want to save the forecaster, should be a json file
docstr_tok: ["Save","the","forecaster",".",":","param","checkpoint_file",":","The","location","you","want","to","save","the","forecaster",",","should","be","a","json","file"]
code: def save(self, checkpoint_file):
      """
      Save the forecaster.
  
      :param checkpoint_file: The location you want to save the forecaster, should be a json file
      """
      if self.internal.model is None:
          raise RuntimeError(
              "You must call fit or restore first before calling save!"
          )
      self.internal.save(checkpoint_file)
  
file_path: analytics-zoo/pyzoo/zoo/chronos/forecaster/prophet_forecaster.py
imports: from zoo.chronos.forecaster.abstract import Forecaster
  from zoo.chronos.model.prophet import ProphetModel
label_desc: Use image node_id 6 for calling the ProphetForecaster obj's underlying member method code with example usage: obj.save(checkpoint_file) without return types